Question

we don't know what to do

what to do 与 how to do 有什么区别吗?
we don't know ___ to do next
A:how B:what
若是再加一道题呢？
we don't know ___ to do it next
A:how B:what

Answer 1

what to do意思是做什么
how to do意思是怎么做
we don't know what to do next.是说“我们不知道下一步要做什么.”
用how的话要写成
we don't know how to do it next.要加一个it,意思是
我们不知道下一步该怎么做（这件事）.